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A shower possible
Variably cloudy, a t-storm
Partly sunny and pleasant
Mostly sunny and very warm
Times of sun and clouds
Following spotty showers and thunderstorms at midweek, warmth will build in the Washington, D.C., and Baltimore areas by this weekend. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.